***UNCHECKED*** [jira] [Updated] (ARROW-1999) [Python] from_numpy_dtype returns wrong types

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-1999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-1999:
----------------------------------
    Labels: pull-request-available  (was: )

> [Python] from_numpy_dtype returns wrong types
> ---------------------------------------------
>
>                 Key: ARROW-1999
>                 URL: https://issues.apache.org/jira/browse/ARROW-1999
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.8.0
>         Environment: Windows 10 Build 15063.850
> Python: 3.6.3
> Numpy: 1.14.0
>            Reporter: Victor Jimenez
>            Assignee: Phillip Cloud
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.9.0
>
>
> The following code shows multiple issues when using {{from_numpy_dtype}}:
> {code}
> import numpy as np
> import pyarrow as pa
> pa.from_numpy_dtype(np.unicode) # returns DataType(bool)
> pa.from_numpy_dtype(np.int)     # returns DataType(bool)
> pa.from_numpy_dtype(np.int64) # Fails with the following message:
> #
> # ArrowNotImplementedError Traceback (most recent call last)
> # <ipython-input-14-ca0855a7dda8> in <module>()
> # ----> 1 pa.from_numpy_dtype(np.int64)
> # 2
> #
> # types.pxi in pyarrow.lib.from_numpy_dtype()
> #
> # error.pxi in pyarrow.lib.check_status()
> #
> # ArrowNotImplementedError: Unsupported numpy type 32760
> {code}
> Additionally, a potentially related issue is also seen when using {{to_pandas_dtype}}:
> {code}
> pa.DataType.to_pandas_dtype(pa.string()) # Returns numpy.object_ 
>                                          # (shouldn't it be numpy.unicode?)
> {code}



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